Djblets 2.2.1 has been released, fixing an issue with building extension packages.
If a project (say, Review Board) made use of build_pipeline_settings() in its settings.py, it could cause problems when trying to build extension packages.
This happened because this function validates some paths that may not exist yet at that stage in the packaging process. This release temporarily disables path validation at this stage.
See the release notes for the full changes.
